Deciding whether to repair or replace a gas water heater depends mainly on the tank's age, whether the tank itself is leaking, and the cost of the repair.
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Quick answer
The single most important factor in a water heater repair-versus-replace decision is whether the tank itself is leaking; a leaking tank cannot be repaired and must be replaced, while a failure of a component such as the thermocouple, gas valve, or igniter on an otherwise sound tank is usually worth repairing, especially on a unit still within its typical service life. Beyond a tank leak, age and repair history matter: a unit approaching or past its typical service life facing a second significant repair is often better replaced than fixed again. As a ballpark, not a quote, a straightforward tankless replacement runs roughly $3,500 to $7,500, while a tank replacement is priced individually depending on size, venting, and access.
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If water is visibly leaking or seeping from the tank body itself, rather than from a fitting, valve, or connection, that is effectively a decision made for you: a corroded or cracked steel tank cannot be repaired and must be replaced. This is different from a leak at the temperature-and-pressure relief valve, a drain valve, or a water connection fitting, all of which are serviceable components that can often be repaired or replaced individually without replacing the whole tank. A technician can usually tell the difference quickly by tracing exactly where the water is originating.
Rust-coloured water coming specifically from the hot tap, especially if cold water runs clear, is another signal worth mentioning to a technician, since it can indicate internal tank corrosion even before an external leak becomes visible.
| Situation | Generally lean toward | Why |
|---|---|---|
| Visible leak from the tank body | Replace | A leaking tank cannot be repaired |
| Newer tank, isolated component failure | Repair | Most of its service life is still ahead |
| Older tank, second major repair in a short span | Replace | Pattern suggests more failures are likely |
| Rusty hot water with no visible leak yet | Have it assessed promptly | May indicate early internal corrosion |
| Pilot won't stay lit, thermocouple or gas valve suspected | Repair | Common, comparatively low-cost fix |
| Tank is well past typical service life even without failure | Consider proactive replacement | Avoids sudden failure and water damage |
Manufacturers do not guarantee a specific lifespan for a water heater, and actual longevity depends on water chemistry, anode rod maintenance, and how hard the unit has worked over the years. Metro Vancouver's municipal water is comparatively soft, which tends to be gentler on tanks than harder water, while homes on Fraser Valley well water can see different wear patterns depending on local water chemistry. A tank that has never had its anode rod checked is generally a weaker candidate for another repair than one with a documented maintenance history, since undetected internal corrosion may already be underway.
A technician's in-person inspection, including checking the anode rod condition where accessible, gives a much better picture of the tank's real remaining life than age alone.
When a tank reaches the point of replacement, it's a reasonable moment to also consider whether switching to a tankless water heater fits the household's hot water needs, space constraints, and venting situation, since the decision to replace already opens up that comparison. This is a separate decision from the repair-versus-replace question itself, and a licensed technician can walk through whether a tank or tankless replacement makes more sense for the specific home rather than defaulting to a like-for-like swap. As a ballpark, not a quote, tankless installation commonly runs $3,500 to $7,500, while a tank replacement is quoted individually based on size, venting, and access after a short assessment.
Safety note
If a gas smell or a suspected gas leak is present at any point, leave the home immediately and call FortisBC at 1-800-663-9911. Any repair or replacement work on a gas water heater must be performed by a Technical Safety BC licensed gas fitter.
No, a leak from the tank body itself means the steel tank has corroded through, and this cannot be repaired; the unit needs to be replaced, though leaks from valves or fittings can often be fixed without a full replacement.
Tracing exactly where water first appears is the key step, and a technician can usually identify this quickly; fittings, valves, and connections are serviceable, while the tank shell itself is not.
Yes, if the tank itself is sound and not leaking, replacing a depleted anode rod is a reasonable and comparatively low-cost way to extend the tank's remaining life.
It's worth considering at that point since you're already facing a replacement decision, but it depends on your household's hot water demand, available space, and venting situation, which a technician can assess.
This is worth having assessed promptly, since it can indicate internal corrosion that may lead to a leak later, even though the tank isn't visibly failing yet.
Programs through FortisBC, CleanBC, and other government sources exist and change over time, so current eligibility should always be confirmed directly rather than assumed when budgeting.
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